updated for version 7.3.340

Problem:    When 'verbosefile' is set ftplugof.vim can give an error.
Solution:   Only remove filetypeplugin autocommands when they exist. (Yasuhiro
            Matsumoto)

src/version.c

@@ -709,6 +709,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    340,
 /**/
     339,
 /**/